GraphQL is a query language for APIs and a runtime for fulfilling those queries with your existing data. GraphQL provides a complete and understandable description of the data in your API, gives clients the power to ask for exactly what they need and nothing more, makes it easier to evolve APIs over time, and enables powerful developer tools.
Notice
This example is based on a react-redux front-end and an express server
Make sure you got MongoDB installed, and service mongod started
Install packages
npm installCreate sample db
npm run seedStart server
npm start
A graphql request
open local browser at localhost:3000
or
use command to make a simple request
curl --data "query={user(id:2){id,name,roles{id,name}}}" localhost:3000/graphql